SYMPOSIA PAPER Published: 09 February 2018
STP87019850012

Ring Ductility of Irradiated Inconel 706 and Nimonic PE16

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The tensile ductility of fast neutron-irradiated, precipitation-hardened alloys, Inconel 706 and Nimonic PE 16, has been observed to be very low for certain test conditions. Explanations for the low ductility behavior have been sought by examination of broken tension specimens with microscopy and other similar techniques. A ring compression test provides a method of evaluating the ductility of irradiated cladding specimens. Unlike the conventional uniaxial tension testing in which the tension specimen is deformed uniformly, the ring specimen is subjected to localized bending where the crack is initiated. The ductility can be estimated through an analysis of the bending of a ring in terms of strain hardening.

Ring sections from irradiated, solution-treated Inconel 706 and Nimonic PE16 were compressed in the diametral direction to provide load-deflection records over a wide range of irradiation and test temperatures. Results showed that ductility in both alloys decreased with increasing test temperatures. The poorest ductility was exhibited at different irradiation temperatures in the two alloys—near 550°C for PE 16 and 460 to 520°C for Inconel 706. The ring ductility data indicate that the grain boundary strength is a major factor in controlling the ductility of the PE16 alloy.

Author Information

Huang, Fan-Hsiung
Westinghouse Hanford Company, Richland, WA, US
Fish, Robert, L.
Rockwell International, Richland, WA, US
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Details
Developed by Committee: E10
Pages: 720–731
DOI: 10.1520/STP87019850012
ISBN-EB: 978-0-8031-7679-9
ISBN-13: 978-0-8031-0592-8